Co 



HANDBOOK OF SHELLS. 



Family 



CLASS III. PTEROPODA. 



Division a. Thecosomata. 



No. of 

 Genus. Species. 



Distribution. 



*' Cleodora \l } Atlantic > Mediterranean, Indian Ocean. 



Limacina 



2 Arctic and Antarctic Seas. 



3. Clio, etc. 



Division b. Gymnosomata. 

 Shell-less. 



CLASS IV. LAMELLIBRANCHIATA. 



Division a. Asiphonida. 



1. Ostrea 100 World-wide in estuaries, attached. 



2. Anomia 20 India, Australia, China, Ceylon attached to shells 



from low water to 100 fathoms. 

 Placuna 4 Scinde, North Australia, China in brackish water. 



3. Pecten 176 World-wide from 3 to 40 fathoms. 



Lima 20 Norway, Britain, India, Australia from i to 150 



fathoms. 

 Spondylus 70 Tropical seas attached to coral-reefs. 



4. Avicula 25 Britain, Mediterranean, India 25 fathoms. 

 Perna 18 In tropical seas attached. 



Pinna 30 United States, Britain, Mediterranean, Australia, 



Pacific low water to 60 fathoms. 



5. Mytilus 70 World-wide between high and low water mark. 

 Modiola 70 British and tropical seas low water to 100 fathoms. 



6. Area 400 In warm seas from low water to 200 fathoms. 

 Pectunculus 58 West Indies, Britain, New Zealand from 8 to 60 



fathoms. 

 Nucula 70 Norway, Japan from 5 to 100 fathoms. 



7. Trigonia 3 Off the coast of Australia. 



8. Unio 420 World-wide in fresh waters. 



Anodon 100 North America, Europe, Siberia in fresh waters, 



Division b. Siphon ida . 



In tropical seas on coral reefs. 

 Indian and Pacific Oceans, Chinese Seas. 

 World-wide from the shore line to 140 fathoms. 

 Tropical and temperate seas sandy and muddy bot- 

 toms from low water to 200 fathoms. 

 Norway, New Zealand, California low water to 200 



fathoms. 



Temperate regions in all fresh waters. 

 From the Nile and other rivers to China and in man- 

 grove swamps. 



(4. Astarte 20 Mostly Arctic from 30 to 112 fathoms. 



Crassatella 34 Australia, Philippines, Africa, etc. 



9. Chama 



to. Tridacna 



ii. Cardium 



"2. Lucina 



Kertia 



13. Cyclas 

 Cyrena 



So 

 7 



200 



70 



20 



60 

 I 3 



